Please use this identifier to cite or link to this item: http://hdl.handle.net/10174/18468

Title: Detection of virulence-associated genes in pathogenic and commensal avian Escherichia coli isolates
Authors: Paixão, Ana
Ferreira, A
Fontes, Miguel
Themudo, Patrícia
Albuquerque, Teresa
Chaveiro Soares, Manuel
Fevereiro, Miguel
Martins, Luís
Correa de Sá, Inácia
Editors: Porter, Tom
Keywords: Avian Pathogenic Escherichia coli (APEC)
Avian Faecal Escherichia coli (AFEC)
Virulence-associated genes (VAG)
Multiplex-PCR
Issue Date: 14-Mar-2016
Publisher: Oxford University Press
Citation: Paixão A C, AC Ferreira, M Fontes, P Themudo, T Albuquerque, MC Soares, M Fevereiro, L Martins, MI Corrêa de Sá. Detection of virulence-associated genes in pathogenic and commensal avian Escherichia coli isolates. Poultry Science. 2016. DOI: 10.3382/ps/pew087
Abstract: Poultry colibacillosis due to Avian Pathogenic Escherichia coli (APEC) is responsible for several extra-intestinal pathological conditions, leading to serious economic damage in poultry production. The most commonly associated pathologies are airsacculitis, colisepticemia, and cellulitis in broiler chickens, and salpingitis and peritonitis in broiler breeders. In this work a total of 66 strains isolated from dead broiler breeders affected with colibacillosis and 61 strains from healthy broilers were studied. Strains from broiler breeders were typified with serogroups O2, O18, and O78, which are mainly associated with disease. The serogroup O78 was the most prevalent (58%). All the strains were checked for the presence of 11 virulence genes: 1) arginine succinyltransferase A (astA); ii) E. coli hemeutilization protein A (chuA); iii) colicin V A/B (cvaA/B); iv) fimbriae mannose-binding type 1 (fimC); v) ferric yersiniabactin uptake A (fyuA); vi) iron-repressible high-molecular-weight proteins 2 (irp2); vii) increased serum survival (iss); viii) iron-uptake systems of E. coli D (iucD); ix) pielonefritis associated to pili C (papC); x) temperature sensitive haemaglutinin (tsh), and xi) vacuolating autotransporter toxin (vat), by Multiplex-PCR. The results showed that all genes are present in both commensal and pathogenic E. coli strains. The iron uptake-related genes and the serum survival gene were more prevalent among APEC. The adhesin genes, except tsh, and the toxin genes, except astA, were also more prevalent among APEC isolates. Except for astA and tsh, APEC strains harbored the majority of the virulence-associated genes studied and fimC was the most prevalent gene, detected in 96.97 and 88.52% of APEC and AFEC strains, respectively. Possession of more than one iron transport system seems to play an important role on APEC survival.
URI: http://ps.oxfordjournals.org/content/early/2016/03/14/ps.pew087
http://hdl.handle.net/10174/18468
Type: article
Appears in Collections:ICAAM - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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